Aerobic activity. Get at least 150 minutes of moderate aerobic activity or 75 minutes of vigorous aerobic activity a week, or a combination of moderate and vigorous activity. The guidelines suggest that you spread out this exercise during the course of a week.
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<span>According
to the SAID principle, if the demands placed upon a muscle cause it to
become stressed, then there exists a chance that the muscle will weaken.
-False
</span>
Answer:
skeletal system
Explanation:
blood cells are made in the bone marrow, which is part of the bones, which is part of the skeletal system
